Password Security
You can protect PDF documents against unauthorized access or modification by specifying password security schemes for them. These can be stored in your system.
To apply a scheme to a PDF document or create a new one, click the 
Organizer Panels button in the View toolbar and choose Security. For details, see Security Panel.
Password security schemes may include the following types of passwords.
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Open Password: If specified, all subsequent document readers are asked to enter it in order to view the document.
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Permissions Password: If specified, any document reader must enter it in order to modify document permission settings for printing, modifying, commenting, copying, etc.
For details, see the Password Security dialog box.